Your numbers
Margin-adjusted LTV
€0
Gross LTV
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Before margin
Customer lifespan
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Years
LTV:CAC ratio
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3:1 is the common "healthy" heuristic
CAC payback period
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Months to recover CAC
3:1 LTV:CAC is a widely-cited heuristic, not a law — capital-efficient businesses often run higher, venture-backed growth-mode businesses sometimes run lower deliberately. Read it in the context of your payback period and cash position.
LTV (gross) = order value × purchases/year × lifespan (years). Margin-adjusted LTV = gross LTV × gross margin. LTV:CAC = margin-adjusted LTV ÷ CAC. CAC payback (months) = CAC ÷ margin-adjusted monthly revenue per customer. A simplified model — ignores discounting and cohort variance. Related: SEO ROI · SEO Cost & Budget. Everything runs locally. Tool provided free by ThrillSEO.